[test][prefix][algorithm] Update loop evaluator write method signature

Following beat.backend.python!61 the method has
now a third argument containing the output currently
written to on the processor side.
5 jobs for update_loop_test_algorithms in 35 minutes (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #175230
docker-build
build_linux_36

00:17:25

64.0%
passed #175231
docker-build
build_linux_37

00:17:24

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macosx
build_macosx_36

00:18:31

64.0%
passed #175232
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build_macosx_37

00:16:29

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failed #175229
macosx
build_macosx_37

00:18:56

64.0%